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I fully agree with Mr Ali. I believe the keyword in the title tag that grabs the audience attention , and keyword length which should not be too long so that he audience do not loose patience are most important.
Keyword in Title TagTitle Tag Starts with Keyword
Keyword in Description Tag Keyword Appears in H1 Tag
Keyword is Most Frequently Used Phrase in Documen
Content Length
Keyword Density
Latent Semantic Indexing Keywords in Content (LSI)
LSI Keywords in Title and Description Tags
Page Loading Speed via HTML
Duplicate Content
Image Optimization
Recency of Content Updates
Historical Updates Page Updates
Keyword in H2, H3 Tags
Keyword Word Order
Grammar and Spelling
Helpful Supplementary Content
Multimedia Contents
Number of Internal Links Pointing to Page
Quality of Internal Links Pointing to Page
There are many factors that affect Page Rank but keep in mind that in order to be successful in SERP (Search Engine Ranking Position) you need to have advanced knowledge of technical SEO. Also know this the algorithm changes several times a week so planning your strategy on a handful of factors can be disastrous in the long run, with less competitive markets you might get away with it but most of the time you will definitely not. There are many common factors such as the meta tags, keywords, content, linkbacks but there are other factors such as the load speed, open graph markup, structured data mark up, visitor traffic signals, CTR, domain relevance, length of domain etc. This is just to name a few of the factors.
If you are asking about Bayt search engine then the answer is 'keywords or proper keywords'. If you are asking about any page, then SEO.